What's the smallest thing in the universe?

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  1. #indivisible
  2. #surrounded
  3. #model
  4. #universe
  5. #building
  6. #discovered
  7. #particle
  8. #cloud
  9. #fundamental
  10. #standard
  11. #electron
  12. #found
  13. #blocks
  14. #experiments
  15. #first
  16. #nucleus
  17. #tinier
  18. #dense
  19. #electrons
  20. #smallest
  21. #matter